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Physics

Physics
How much mechanical work must be done to completely melt 1 gram of ice at 0°C ?

4.2 J
2268 J
336 J
80 J

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Physics
Which of the following is arranged in order of decreasing conductivity?

Copper, Silver, Aluminium, Steel
Aluminium, Silver, Copper, Steel
Silver, Copper, Aluminium, Steel
Copper, Aluminium, Steel, Silver

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Physics
Waves that are required for long distance wireless communication are

Infrared rays
Microwaves
Ultraviolet rays
Radio waves

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Physics
The unit of magnetic permeability is

Weber/meter
Weber
Henry
Henry/meter

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Physics
The reverse effect of X–ray emission is

Zeeman effect
Raman effect
Compton effect
Photoelectric

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Physics
A boy sitting in an open car moving with the constant speed throws a ball straight up into the air. The ball falls

Behind him
By his side
In front of him
Into his hand

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